ExprEngineC.cpp revision 249423
1226586Sdim//=-- ExprEngineC.cpp - ExprEngine support for C expressions ----*- C++ -*-===// 2226586Sdim// 3226586Sdim// The LLVM Compiler Infrastructure 4226586Sdim// 5226586Sdim// This file is distributed under the University of Illinois Open Source 6226586Sdim// License. See LICENSE.TXT for details. 7226586Sdim// 8226586Sdim//===----------------------------------------------------------------------===// 9226586Sdim// 10226586Sdim// This file defines ExprEngine's support for C expressions. 11226586Sdim// 12226586Sdim//===----------------------------------------------------------------------===// 13226586Sdim 14249423Sdim#include "clang/AST/ExprCXX.h" 15226586Sdim#include "clang/StaticAnalyzer/Core/CheckerManager.h" 16226586Sdim#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 17226586Sdim 18226586Sdimusing namespace clang; 19226586Sdimusing namespace ento; 20226586Sdimusing llvm::APSInt; 21226586Sdim 22226586Sdimvoid ExprEngine::VisitBinaryOperator(const BinaryOperator* B, 23226586Sdim ExplodedNode *Pred, 24226586Sdim ExplodedNodeSet &Dst) { 25226586Sdim 26226586Sdim Expr *LHS = B->getLHS()->IgnoreParens(); 27226586Sdim Expr *RHS = B->getRHS()->IgnoreParens(); 28226586Sdim 29226586Sdim // FIXME: Prechecks eventually go in ::Visit(). 30226586Sdim ExplodedNodeSet CheckedSet; 31226586Sdim ExplodedNodeSet Tmp2; 32226586Sdim getCheckerManager().runCheckersForPreStmt(CheckedSet, Pred, B, *this); 33226586Sdim 34226586Sdim // With both the LHS and RHS evaluated, process the operation itself. 35226586Sdim for (ExplodedNodeSet::iterator it=CheckedSet.begin(), ei=CheckedSet.end(); 36226586Sdim it != ei; ++it) { 37226586Sdim 38234353Sdim ProgramStateRef state = (*it)->getState(); 39234353Sdim const LocationContext *LCtx = (*it)->getLocationContext(); 40234353Sdim SVal LeftV = state->getSVal(LHS, LCtx); 41234353Sdim SVal RightV = state->getSVal(RHS, LCtx); 42226586Sdim 43226586Sdim BinaryOperator::Opcode Op = B->getOpcode(); 44226586Sdim 45226586Sdim if (Op == BO_Assign) { 46226586Sdim // EXPERIMENTAL: "Conjured" symbols. 47226586Sdim // FIXME: Handle structs. 48234353Sdim if (RightV.isUnknown()) { 49243830Sdim unsigned Count = currBldrCtx->blockCount(); 50243830Sdim RightV = svalBuilder.conjureSymbolVal(0, B->getRHS(), LCtx, Count); 51226586Sdim } 52226586Sdim // Simulate the effects of a "store": bind the value of the RHS 53226586Sdim // to the L-Value represented by the LHS. 54239462Sdim SVal ExprVal = B->isGLValue() ? LeftV : RightV; 55234353Sdim evalStore(Tmp2, B, LHS, *it, state->BindExpr(B, LCtx, ExprVal), 56234353Sdim LeftV, RightV); 57226586Sdim continue; 58226586Sdim } 59226586Sdim 60226586Sdim if (!B->isAssignmentOp()) { 61243830Sdim StmtNodeBuilder Bldr(*it, Tmp2, *currBldrCtx); 62239462Sdim 63239462Sdim if (B->isAdditiveOp()) { 64239462Sdim // If one of the operands is a location, conjure a symbol for the other 65239462Sdim // one (offset) if it's unknown so that memory arithmetic always 66239462Sdim // results in an ElementRegion. 67239462Sdim // TODO: This can be removed after we enable history tracking with 68239462Sdim // SymSymExpr. 69243830Sdim unsigned Count = currBldrCtx->blockCount(); 70249423Sdim if (LeftV.getAs<Loc>() && 71239462Sdim RHS->getType()->isIntegerType() && RightV.isUnknown()) { 72243830Sdim RightV = svalBuilder.conjureSymbolVal(RHS, LCtx, RHS->getType(), 73243830Sdim Count); 74239462Sdim } 75249423Sdim if (RightV.getAs<Loc>() && 76239462Sdim LHS->getType()->isIntegerType() && LeftV.isUnknown()) { 77243830Sdim LeftV = svalBuilder.conjureSymbolVal(LHS, LCtx, LHS->getType(), 78243830Sdim Count); 79239462Sdim } 80239462Sdim } 81239462Sdim 82226586Sdim // Process non-assignments except commas or short-circuited 83226586Sdim // logical expressions (LAnd and LOr). 84226586Sdim SVal Result = evalBinOp(state, Op, LeftV, RightV, B->getType()); 85226586Sdim if (Result.isUnknown()) { 86234353Sdim Bldr.generateNode(B, *it, state); 87226586Sdim continue; 88226586Sdim } 89226586Sdim 90234353Sdim state = state->BindExpr(B, LCtx, Result); 91234353Sdim Bldr.generateNode(B, *it, state); 92226586Sdim continue; 93226586Sdim } 94226586Sdim 95226586Sdim assert (B->isCompoundAssignmentOp()); 96226586Sdim 97226586Sdim switch (Op) { 98226586Sdim default: 99226586Sdim llvm_unreachable("Invalid opcode for compound assignment."); 100226586Sdim case BO_MulAssign: Op = BO_Mul; break; 101226586Sdim case BO_DivAssign: Op = BO_Div; break; 102226586Sdim case BO_RemAssign: Op = BO_Rem; break; 103226586Sdim case BO_AddAssign: Op = BO_Add; break; 104226586Sdim case BO_SubAssign: Op = BO_Sub; break; 105226586Sdim case BO_ShlAssign: Op = BO_Shl; break; 106226586Sdim case BO_ShrAssign: Op = BO_Shr; break; 107226586Sdim case BO_AndAssign: Op = BO_And; break; 108226586Sdim case BO_XorAssign: Op = BO_Xor; break; 109226586Sdim case BO_OrAssign: Op = BO_Or; break; 110226586Sdim } 111226586Sdim 112226586Sdim // Perform a load (the LHS). This performs the checks for 113226586Sdim // null dereferences, and so on. 114226586Sdim ExplodedNodeSet Tmp; 115226586Sdim SVal location = LeftV; 116234353Sdim evalLoad(Tmp, B, LHS, *it, state, location); 117226586Sdim 118226586Sdim for (ExplodedNodeSet::iterator I = Tmp.begin(), E = Tmp.end(); I != E; 119226586Sdim ++I) { 120226586Sdim 121226586Sdim state = (*I)->getState(); 122234353Sdim const LocationContext *LCtx = (*I)->getLocationContext(); 123234353Sdim SVal V = state->getSVal(LHS, LCtx); 124226586Sdim 125226586Sdim // Get the computation type. 126226586Sdim QualType CTy = 127226586Sdim cast<CompoundAssignOperator>(B)->getComputationResultType(); 128226586Sdim CTy = getContext().getCanonicalType(CTy); 129226586Sdim 130226586Sdim QualType CLHSTy = 131226586Sdim cast<CompoundAssignOperator>(B)->getComputationLHSType(); 132226586Sdim CLHSTy = getContext().getCanonicalType(CLHSTy); 133226586Sdim 134226586Sdim QualType LTy = getContext().getCanonicalType(LHS->getType()); 135226586Sdim 136226586Sdim // Promote LHS. 137226586Sdim V = svalBuilder.evalCast(V, CLHSTy, LTy); 138226586Sdim 139226586Sdim // Compute the result of the operation. 140226586Sdim SVal Result = svalBuilder.evalCast(evalBinOp(state, Op, V, RightV, CTy), 141226586Sdim B->getType(), CTy); 142226586Sdim 143226586Sdim // EXPERIMENTAL: "Conjured" symbols. 144226586Sdim // FIXME: Handle structs. 145226586Sdim 146226586Sdim SVal LHSVal; 147226586Sdim 148234353Sdim if (Result.isUnknown()) { 149226586Sdim // The symbolic value is actually for the type of the left-hand side 150226586Sdim // expression, not the computation type, as this is the value the 151226586Sdim // LValue on the LHS will bind to. 152243830Sdim LHSVal = svalBuilder.conjureSymbolVal(0, B->getRHS(), LCtx, LTy, 153243830Sdim currBldrCtx->blockCount()); 154226586Sdim // However, we need to convert the symbol to the computation type. 155226586Sdim Result = svalBuilder.evalCast(LHSVal, CTy, LTy); 156226586Sdim } 157226586Sdim else { 158226586Sdim // The left-hand side may bind to a different value then the 159226586Sdim // computation type. 160226586Sdim LHSVal = svalBuilder.evalCast(Result, LTy, CTy); 161226586Sdim } 162226586Sdim 163226586Sdim // In C++, assignment and compound assignment operators return an 164226586Sdim // lvalue. 165239462Sdim if (B->isGLValue()) 166234353Sdim state = state->BindExpr(B, LCtx, location); 167226586Sdim else 168234353Sdim state = state->BindExpr(B, LCtx, Result); 169226586Sdim 170226586Sdim evalStore(Tmp2, B, LHS, *I, state, location, LHSVal); 171226586Sdim } 172226586Sdim } 173226586Sdim 174226586Sdim // FIXME: postvisits eventually go in ::Visit() 175226586Sdim getCheckerManager().runCheckersForPostStmt(Dst, Tmp2, B, *this); 176226586Sdim} 177226586Sdim 178226586Sdimvoid ExprEngine::VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 179226586Sdim ExplodedNodeSet &Dst) { 180226586Sdim 181226586Sdim CanQualType T = getContext().getCanonicalType(BE->getType()); 182239462Sdim 183239462Sdim // Get the value of the block itself. 184226586Sdim SVal V = svalBuilder.getBlockPointer(BE->getBlockDecl(), T, 185226586Sdim Pred->getLocationContext()); 186226586Sdim 187239462Sdim ProgramStateRef State = Pred->getState(); 188239462Sdim 189239462Sdim // If we created a new MemRegion for the block, we should explicitly bind 190239462Sdim // the captured variables. 191239462Sdim if (const BlockDataRegion *BDR = 192239462Sdim dyn_cast_or_null<BlockDataRegion>(V.getAsRegion())) { 193239462Sdim 194239462Sdim BlockDataRegion::referenced_vars_iterator I = BDR->referenced_vars_begin(), 195239462Sdim E = BDR->referenced_vars_end(); 196239462Sdim 197239462Sdim for (; I != E; ++I) { 198239462Sdim const MemRegion *capturedR = I.getCapturedRegion(); 199239462Sdim const MemRegion *originalR = I.getOriginalRegion(); 200239462Sdim if (capturedR != originalR) { 201239462Sdim SVal originalV = State->getSVal(loc::MemRegionVal(originalR)); 202239462Sdim State = State->bindLoc(loc::MemRegionVal(capturedR), originalV); 203239462Sdim } 204239462Sdim } 205239462Sdim } 206239462Sdim 207226586Sdim ExplodedNodeSet Tmp; 208243830Sdim StmtNodeBuilder Bldr(Pred, Tmp, *currBldrCtx); 209234353Sdim Bldr.generateNode(BE, Pred, 210239462Sdim State->BindExpr(BE, Pred->getLocationContext(), V), 211243830Sdim 0, ProgramPoint::PostLValueKind); 212226586Sdim 213226586Sdim // FIXME: Move all post/pre visits to ::Visit(). 214226586Sdim getCheckerManager().runCheckersForPostStmt(Dst, Tmp, BE, *this); 215226586Sdim} 216226586Sdim 217226586Sdimvoid ExprEngine::VisitCast(const CastExpr *CastE, const Expr *Ex, 218226586Sdim ExplodedNode *Pred, ExplodedNodeSet &Dst) { 219226586Sdim 220226586Sdim ExplodedNodeSet dstPreStmt; 221226586Sdim getCheckerManager().runCheckersForPreStmt(dstPreStmt, Pred, CastE, *this); 222226586Sdim 223234353Sdim if (CastE->getCastKind() == CK_LValueToRValue) { 224226586Sdim for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 225226586Sdim I!=E; ++I) { 226226586Sdim ExplodedNode *subExprNode = *I; 227234353Sdim ProgramStateRef state = subExprNode->getState(); 228234353Sdim const LocationContext *LCtx = subExprNode->getLocationContext(); 229234353Sdim evalLoad(Dst, CastE, CastE, subExprNode, state, state->getSVal(Ex, LCtx)); 230226586Sdim } 231226586Sdim return; 232226586Sdim } 233226586Sdim 234226586Sdim // All other casts. 235226586Sdim QualType T = CastE->getType(); 236226586Sdim QualType ExTy = Ex->getType(); 237226586Sdim 238226586Sdim if (const ExplicitCastExpr *ExCast=dyn_cast_or_null<ExplicitCastExpr>(CastE)) 239226586Sdim T = ExCast->getTypeAsWritten(); 240226586Sdim 241243830Sdim StmtNodeBuilder Bldr(dstPreStmt, Dst, *currBldrCtx); 242226586Sdim for (ExplodedNodeSet::iterator I = dstPreStmt.begin(), E = dstPreStmt.end(); 243226586Sdim I != E; ++I) { 244226586Sdim 245226586Sdim Pred = *I; 246243830Sdim ProgramStateRef state = Pred->getState(); 247243830Sdim const LocationContext *LCtx = Pred->getLocationContext(); 248243830Sdim 249226586Sdim switch (CastE->getCastKind()) { 250226586Sdim case CK_LValueToRValue: 251226586Sdim llvm_unreachable("LValueToRValue casts handled earlier."); 252226586Sdim case CK_ToVoid: 253226586Sdim continue; 254226586Sdim // The analyzer doesn't do anything special with these casts, 255226586Sdim // since it understands retain/release semantics already. 256226586Sdim case CK_ARCProduceObject: 257226586Sdim case CK_ARCConsumeObject: 258226586Sdim case CK_ARCReclaimReturnedObject: 259226586Sdim case CK_ARCExtendBlockObject: // Fall-through. 260234353Sdim case CK_CopyAndAutoreleaseBlockObject: 261234353Sdim // The analyser can ignore atomic casts for now, although some future 262234353Sdim // checkers may want to make certain that you're not modifying the same 263234353Sdim // value through atomic and nonatomic pointers. 264234353Sdim case CK_AtomicToNonAtomic: 265234353Sdim case CK_NonAtomicToAtomic: 266226586Sdim // True no-ops. 267226586Sdim case CK_NoOp: 268243830Sdim case CK_ConstructorConversion: 269243830Sdim case CK_UserDefinedConversion: 270243830Sdim case CK_FunctionToPointerDecay: 271243830Sdim case CK_BuiltinFnToFnPtr: { 272226586Sdim // Copy the SVal of Ex to CastE. 273234353Sdim ProgramStateRef state = Pred->getState(); 274234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 275234353Sdim SVal V = state->getSVal(Ex, LCtx); 276234353Sdim state = state->BindExpr(CastE, LCtx, V); 277234353Sdim Bldr.generateNode(CastE, Pred, state); 278226586Sdim continue; 279226586Sdim } 280243830Sdim case CK_MemberPointerToBoolean: 281243830Sdim // FIXME: For now, member pointers are represented by void *. 282243830Sdim // FALLTHROUGH 283226586Sdim case CK_Dependent: 284226586Sdim case CK_ArrayToPointerDecay: 285226586Sdim case CK_BitCast: 286226586Sdim case CK_IntegralCast: 287226586Sdim case CK_NullToPointer: 288226586Sdim case CK_IntegralToPointer: 289226586Sdim case CK_PointerToIntegral: 290226586Sdim case CK_PointerToBoolean: 291226586Sdim case CK_IntegralToBoolean: 292226586Sdim case CK_IntegralToFloating: 293226586Sdim case CK_FloatingToIntegral: 294226586Sdim case CK_FloatingToBoolean: 295226586Sdim case CK_FloatingCast: 296226586Sdim case CK_FloatingRealToComplex: 297226586Sdim case CK_FloatingComplexToReal: 298226586Sdim case CK_FloatingComplexToBoolean: 299226586Sdim case CK_FloatingComplexCast: 300226586Sdim case CK_FloatingComplexToIntegralComplex: 301226586Sdim case CK_IntegralRealToComplex: 302226586Sdim case CK_IntegralComplexToReal: 303226586Sdim case CK_IntegralComplexToBoolean: 304226586Sdim case CK_IntegralComplexCast: 305226586Sdim case CK_IntegralComplexToFloatingComplex: 306226586Sdim case CK_CPointerToObjCPointerCast: 307226586Sdim case CK_BlockPointerToObjCPointerCast: 308226586Sdim case CK_AnyPointerToBlockPointerCast: 309249423Sdim case CK_ObjCObjectLValueCast: 310249423Sdim case CK_ZeroToOCLEvent: { 311226586Sdim // Delegate to SValBuilder to process. 312234353Sdim SVal V = state->getSVal(Ex, LCtx); 313226586Sdim V = svalBuilder.evalCast(V, T, ExTy); 314234353Sdim state = state->BindExpr(CastE, LCtx, V); 315234353Sdim Bldr.generateNode(CastE, Pred, state); 316226586Sdim continue; 317226586Sdim } 318226586Sdim case CK_DerivedToBase: 319226586Sdim case CK_UncheckedDerivedToBase: { 320226586Sdim // For DerivedToBase cast, delegate to the store manager. 321234353Sdim SVal val = state->getSVal(Ex, LCtx); 322239462Sdim val = getStoreManager().evalDerivedToBase(val, CastE); 323234353Sdim state = state->BindExpr(CastE, LCtx, val); 324234353Sdim Bldr.generateNode(CastE, Pred, state); 325226586Sdim continue; 326226586Sdim } 327234353Sdim // Handle C++ dyn_cast. 328234353Sdim case CK_Dynamic: { 329234353Sdim SVal val = state->getSVal(Ex, LCtx); 330234353Sdim 331234353Sdim // Compute the type of the result. 332234353Sdim QualType resultType = CastE->getType(); 333239462Sdim if (CastE->isGLValue()) 334234353Sdim resultType = getContext().getPointerType(resultType); 335234353Sdim 336234353Sdim bool Failed = false; 337234353Sdim 338234353Sdim // Check if the value being cast evaluates to 0. 339234353Sdim if (val.isZeroConstant()) 340234353Sdim Failed = true; 341234353Sdim // Else, evaluate the cast. 342234353Sdim else 343234353Sdim val = getStoreManager().evalDynamicCast(val, T, Failed); 344234353Sdim 345234353Sdim if (Failed) { 346234353Sdim if (T->isReferenceType()) { 347234353Sdim // A bad_cast exception is thrown if input value is a reference. 348234353Sdim // Currently, we model this, by generating a sink. 349243830Sdim Bldr.generateSink(CastE, Pred, state); 350234353Sdim continue; 351234353Sdim } else { 352234353Sdim // If the cast fails on a pointer, bind to 0. 353234353Sdim state = state->BindExpr(CastE, LCtx, svalBuilder.makeNull()); 354234353Sdim } 355234353Sdim } else { 356234353Sdim // If we don't know if the cast succeeded, conjure a new symbol. 357234353Sdim if (val.isUnknown()) { 358243830Sdim DefinedOrUnknownSVal NewSym = 359243830Sdim svalBuilder.conjureSymbolVal(0, CastE, LCtx, resultType, 360243830Sdim currBldrCtx->blockCount()); 361234353Sdim state = state->BindExpr(CastE, LCtx, NewSym); 362234353Sdim } else 363234353Sdim // Else, bind to the derived region value. 364234353Sdim state = state->BindExpr(CastE, LCtx, val); 365234353Sdim } 366234353Sdim Bldr.generateNode(CastE, Pred, state); 367234353Sdim continue; 368234353Sdim } 369243830Sdim case CK_NullToMemberPointer: { 370243830Sdim // FIXME: For now, member pointers are represented by void *. 371243830Sdim SVal V = svalBuilder.makeIntValWithPtrWidth(0, true); 372243830Sdim state = state->BindExpr(CastE, LCtx, V); 373243830Sdim Bldr.generateNode(CastE, Pred, state); 374243830Sdim continue; 375243830Sdim } 376234353Sdim // Various C++ casts that are not handled yet. 377226586Sdim case CK_ToUnion: 378226586Sdim case CK_BaseToDerived: 379226586Sdim case CK_BaseToDerivedMemberPointer: 380226586Sdim case CK_DerivedToBaseMemberPointer: 381234353Sdim case CK_ReinterpretMemberPointer: 382226586Sdim case CK_VectorSplat: 383239462Sdim case CK_LValueBitCast: { 384226586Sdim // Recover some path-sensitivty by conjuring a new value. 385226586Sdim QualType resultType = CastE->getType(); 386239462Sdim if (CastE->isGLValue()) 387226586Sdim resultType = getContext().getPointerType(resultType); 388243830Sdim SVal result = svalBuilder.conjureSymbolVal(0, CastE, LCtx, 389243830Sdim resultType, 390243830Sdim currBldrCtx->blockCount()); 391243830Sdim state = state->BindExpr(CastE, LCtx, result); 392234353Sdim Bldr.generateNode(CastE, Pred, state); 393226586Sdim continue; 394226586Sdim } 395226586Sdim } 396226586Sdim } 397226586Sdim} 398226586Sdim 399226586Sdimvoid ExprEngine::VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 400226586Sdim ExplodedNode *Pred, 401226586Sdim ExplodedNodeSet &Dst) { 402243830Sdim StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 403234353Sdim 404226586Sdim const InitListExpr *ILE 405226586Sdim = cast<InitListExpr>(CL->getInitializer()->IgnoreParens()); 406226586Sdim 407234353Sdim ProgramStateRef state = Pred->getState(); 408234353Sdim SVal ILV = state->getSVal(ILE, Pred->getLocationContext()); 409226586Sdim const LocationContext *LC = Pred->getLocationContext(); 410226586Sdim state = state->bindCompoundLiteral(CL, LC, ILV); 411239462Sdim 412239462Sdim // Compound literal expressions are a GNU extension in C++. 413239462Sdim // Unlike in C, where CLs are lvalues, in C++ CLs are prvalues, 414239462Sdim // and like temporary objects created by the functional notation T() 415239462Sdim // CLs are destroyed at the end of the containing full-expression. 416239462Sdim // HOWEVER, an rvalue of array type is not something the analyzer can 417239462Sdim // reason about, since we expect all regions to be wrapped in Locs. 418239462Sdim // So we treat array CLs as lvalues as well, knowing that they will decay 419239462Sdim // to pointers as soon as they are used. 420239462Sdim if (CL->isGLValue() || CL->getType()->isArrayType()) 421234353Sdim B.generateNode(CL, Pred, state->BindExpr(CL, LC, state->getLValue(CL, LC))); 422226586Sdim else 423234353Sdim B.generateNode(CL, Pred, state->BindExpr(CL, LC, ILV)); 424226586Sdim} 425226586Sdim 426226586Sdimvoid ExprEngine::VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 427226586Sdim ExplodedNodeSet &Dst) { 428226586Sdim // Assumption: The CFG has one DeclStmt per Decl. 429249423Sdim const VarDecl *VD = dyn_cast_or_null<VarDecl>(*DS->decl_begin()); 430249423Sdim 431249423Sdim if (!VD) { 432234353Sdim //TODO:AZ: remove explicit insertion after refactoring is done. 433234353Sdim Dst.insert(Pred); 434226586Sdim return; 435234353Sdim } 436226586Sdim 437226586Sdim // FIXME: all pre/post visits should eventually be handled by ::Visit(). 438226586Sdim ExplodedNodeSet dstPreVisit; 439226586Sdim getCheckerManager().runCheckersForPreStmt(dstPreVisit, Pred, DS, *this); 440226586Sdim 441243830Sdim StmtNodeBuilder B(dstPreVisit, Dst, *currBldrCtx); 442226586Sdim for (ExplodedNodeSet::iterator I = dstPreVisit.begin(), E = dstPreVisit.end(); 443226586Sdim I!=E; ++I) { 444226586Sdim ExplodedNode *N = *I; 445234353Sdim ProgramStateRef state = N->getState(); 446249423Sdim const LocationContext *LC = N->getLocationContext(); 447249423Sdim 448226586Sdim // Decls without InitExpr are not initialized explicitly. 449226586Sdim if (const Expr *InitEx = VD->getInit()) { 450249423Sdim 451249423Sdim // Note in the state that the initialization has occurred. 452249423Sdim ExplodedNode *UpdatedN = N; 453239462Sdim SVal InitVal = state->getSVal(InitEx, LC); 454234353Sdim 455249423Sdim if (isa<CXXConstructExpr>(InitEx->IgnoreImplicit())) { 456239462Sdim // We constructed the object directly in the variable. 457239462Sdim // No need to bind anything. 458249423Sdim B.generateNode(DS, UpdatedN, state); 459239462Sdim } else { 460239462Sdim // We bound the temp obj region to the CXXConstructExpr. Now recover 461239462Sdim // the lazy compound value when the variable is not a reference. 462249423Sdim if (AMgr.getLangOpts().CPlusPlus && VD->getType()->isRecordType() && 463249423Sdim !VD->getType()->isReferenceType()) { 464249423Sdim if (Optional<loc::MemRegionVal> M = 465249423Sdim InitVal.getAs<loc::MemRegionVal>()) { 466249423Sdim InitVal = state->getSVal(M->getRegion()); 467249423Sdim assert(InitVal.getAs<nonloc::LazyCompoundVal>()); 468249423Sdim } 469239462Sdim } 470239462Sdim 471239462Sdim // Recover some path-sensitivity if a scalar value evaluated to 472239462Sdim // UnknownVal. 473239462Sdim if (InitVal.isUnknown()) { 474239462Sdim QualType Ty = InitEx->getType(); 475239462Sdim if (InitEx->isGLValue()) { 476239462Sdim Ty = getContext().getPointerType(Ty); 477239462Sdim } 478239462Sdim 479243830Sdim InitVal = svalBuilder.conjureSymbolVal(0, InitEx, LC, Ty, 480243830Sdim currBldrCtx->blockCount()); 481239462Sdim } 482249423Sdim 483249423Sdim 484249423Sdim B.takeNodes(UpdatedN); 485239462Sdim ExplodedNodeSet Dst2; 486249423Sdim evalBind(Dst2, DS, UpdatedN, state->getLValue(VD, LC), InitVal, true); 487239462Sdim B.addNodes(Dst2); 488226586Sdim } 489226586Sdim } 490226586Sdim else { 491243830Sdim B.generateNode(DS, N, state); 492226586Sdim } 493226586Sdim } 494226586Sdim} 495226586Sdim 496226586Sdimvoid ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 497226586Sdim ExplodedNodeSet &Dst) { 498226586Sdim assert(B->getOpcode() == BO_LAnd || 499226586Sdim B->getOpcode() == BO_LOr); 500234353Sdim 501243830Sdim StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 502234353Sdim ProgramStateRef state = Pred->getState(); 503239462Sdim 504239462Sdim ExplodedNode *N = Pred; 505249423Sdim while (!N->getLocation().getAs<BlockEntrance>()) { 506239462Sdim ProgramPoint P = N->getLocation(); 507249423Sdim assert(P.getAs<PreStmt>()|| P.getAs<PreStmtPurgeDeadSymbols>()); 508239462Sdim (void) P; 509239462Sdim assert(N->pred_size() == 1); 510239462Sdim N = *N->pred_begin(); 511226586Sdim } 512239462Sdim assert(N->pred_size() == 1); 513239462Sdim N = *N->pred_begin(); 514249423Sdim BlockEdge BE = N->getLocation().castAs<BlockEdge>(); 515239462Sdim SVal X; 516239462Sdim 517239462Sdim // Determine the value of the expression by introspecting how we 518239462Sdim // got this location in the CFG. This requires looking at the previous 519239462Sdim // block we were in and what kind of control-flow transfer was involved. 520239462Sdim const CFGBlock *SrcBlock = BE.getSrc(); 521239462Sdim // The only terminator (if there is one) that makes sense is a logical op. 522239462Sdim CFGTerminator T = SrcBlock->getTerminator(); 523239462Sdim if (const BinaryOperator *Term = cast_or_null<BinaryOperator>(T.getStmt())) { 524239462Sdim (void) Term; 525239462Sdim assert(Term->isLogicalOp()); 526239462Sdim assert(SrcBlock->succ_size() == 2); 527239462Sdim // Did we take the true or false branch? 528239462Sdim unsigned constant = (*SrcBlock->succ_begin() == BE.getDst()) ? 1 : 0; 529239462Sdim X = svalBuilder.makeIntVal(constant, B->getType()); 530239462Sdim } 531226586Sdim else { 532239462Sdim // If there is no terminator, by construction the last statement 533239462Sdim // in SrcBlock is the value of the enclosing expression. 534243830Sdim // However, we still need to constrain that value to be 0 or 1. 535239462Sdim assert(!SrcBlock->empty()); 536249423Sdim CFGStmt Elem = SrcBlock->rbegin()->castAs<CFGStmt>(); 537243830Sdim const Expr *RHS = cast<Expr>(Elem.getStmt()); 538243830Sdim SVal RHSVal = N->getState()->getSVal(RHS, Pred->getLocationContext()); 539243830Sdim 540249423Sdim if (RHSVal.isUndef()) { 541249423Sdim X = RHSVal; 542249423Sdim } else { 543249423Sdim DefinedOrUnknownSVal DefinedRHS = RHSVal.castAs<DefinedOrUnknownSVal>(); 544249423Sdim ProgramStateRef StTrue, StFalse; 545249423Sdim llvm::tie(StTrue, StFalse) = N->getState()->assume(DefinedRHS); 546249423Sdim if (StTrue) { 547249423Sdim if (StFalse) { 548249423Sdim // We can't constrain the value to 0 or 1. 549249423Sdim // The best we can do is a cast. 550249423Sdim X = getSValBuilder().evalCast(RHSVal, B->getType(), RHS->getType()); 551249423Sdim } else { 552249423Sdim // The value is known to be true. 553249423Sdim X = getSValBuilder().makeIntVal(1, B->getType()); 554249423Sdim } 555243830Sdim } else { 556249423Sdim // The value is known to be false. 557249423Sdim assert(StFalse && "Infeasible path!"); 558249423Sdim X = getSValBuilder().makeIntVal(0, B->getType()); 559243830Sdim } 560243830Sdim } 561226586Sdim } 562239462Sdim Bldr.generateNode(B, Pred, state->BindExpr(B, Pred->getLocationContext(), X)); 563226586Sdim} 564226586Sdim 565226586Sdimvoid ExprEngine::VisitInitListExpr(const InitListExpr *IE, 566226586Sdim ExplodedNode *Pred, 567226586Sdim ExplodedNodeSet &Dst) { 568243830Sdim StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 569226586Sdim 570234353Sdim ProgramStateRef state = Pred->getState(); 571234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 572226586Sdim QualType T = getContext().getCanonicalType(IE->getType()); 573226586Sdim unsigned NumInitElements = IE->getNumInits(); 574226586Sdim 575243830Sdim if (T->isArrayType() || T->isRecordType() || T->isVectorType() || 576243830Sdim T->isAnyComplexType()) { 577226586Sdim llvm::ImmutableList<SVal> vals = getBasicVals().getEmptySValList(); 578226586Sdim 579226586Sdim // Handle base case where the initializer has no elements. 580226586Sdim // e.g: static int* myArray[] = {}; 581226586Sdim if (NumInitElements == 0) { 582226586Sdim SVal V = svalBuilder.makeCompoundVal(T, vals); 583234353Sdim B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 584226586Sdim return; 585226586Sdim } 586226586Sdim 587226586Sdim for (InitListExpr::const_reverse_iterator it = IE->rbegin(), 588226586Sdim ei = IE->rend(); it != ei; ++it) { 589249423Sdim SVal V = state->getSVal(cast<Expr>(*it), LCtx); 590249423Sdim if (dyn_cast_or_null<CXXTempObjectRegion>(V.getAsRegion())) 591249423Sdim V = UnknownVal(); 592249423Sdim vals = getBasicVals().consVals(V, vals); 593226586Sdim } 594226586Sdim 595234353Sdim B.generateNode(IE, Pred, 596234353Sdim state->BindExpr(IE, LCtx, 597234353Sdim svalBuilder.makeCompoundVal(T, vals))); 598226586Sdim return; 599226586Sdim } 600239462Sdim 601239462Sdim // Handle scalars: int{5} and int{}. 602239462Sdim assert(NumInitElements <= 1); 603239462Sdim 604239462Sdim SVal V; 605239462Sdim if (NumInitElements == 0) 606239462Sdim V = getSValBuilder().makeZeroVal(T); 607239462Sdim else 608239462Sdim V = state->getSVal(IE->getInit(0), LCtx); 609239462Sdim 610239462Sdim B.generateNode(IE, Pred, state->BindExpr(IE, LCtx, V)); 611226586Sdim} 612226586Sdim 613226586Sdimvoid ExprEngine::VisitGuardedExpr(const Expr *Ex, 614226586Sdim const Expr *L, 615226586Sdim const Expr *R, 616226586Sdim ExplodedNode *Pred, 617226586Sdim ExplodedNodeSet &Dst) { 618243830Sdim StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 619234353Sdim ProgramStateRef state = Pred->getState(); 620234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 621239462Sdim const CFGBlock *SrcBlock = 0; 622239462Sdim 623239462Sdim for (const ExplodedNode *N = Pred ; N ; N = *N->pred_begin()) { 624239462Sdim ProgramPoint PP = N->getLocation(); 625249423Sdim if (PP.getAs<PreStmtPurgeDeadSymbols>() || PP.getAs<BlockEntrance>()) { 626239462Sdim assert(N->pred_size() == 1); 627239462Sdim continue; 628239462Sdim } 629249423Sdim SrcBlock = PP.castAs<BlockEdge>().getSrc(); 630239462Sdim break; 631239462Sdim } 632239462Sdim 633249423Sdim assert(SrcBlock && "missing function entry"); 634249423Sdim 635239462Sdim // Find the last expression in the predecessor block. That is the 636239462Sdim // expression that is used for the value of the ternary expression. 637239462Sdim bool hasValue = false; 638239462Sdim SVal V; 639239462Sdim 640239462Sdim for (CFGBlock::const_reverse_iterator I = SrcBlock->rbegin(), 641239462Sdim E = SrcBlock->rend(); I != E; ++I) { 642239462Sdim CFGElement CE = *I; 643249423Sdim if (Optional<CFGStmt> CS = CE.getAs<CFGStmt>()) { 644239462Sdim const Expr *ValEx = cast<Expr>(CS->getStmt()); 645239462Sdim hasValue = true; 646239462Sdim V = state->getSVal(ValEx, LCtx); 647239462Sdim break; 648239462Sdim } 649239462Sdim } 650239462Sdim 651239462Sdim assert(hasValue); 652239462Sdim (void) hasValue; 653239462Sdim 654239462Sdim // Generate a new node with the binding from the appropriate path. 655239462Sdim B.generateNode(Ex, Pred, state->BindExpr(Ex, LCtx, V, true)); 656226586Sdim} 657226586Sdim 658226586Sdimvoid ExprEngine:: 659226586SdimVisitOffsetOfExpr(const OffsetOfExpr *OOE, 660226586Sdim ExplodedNode *Pred, ExplodedNodeSet &Dst) { 661243830Sdim StmtNodeBuilder B(Pred, Dst, *currBldrCtx); 662234353Sdim APSInt IV; 663234353Sdim if (OOE->EvaluateAsInt(IV, getContext())) { 664226586Sdim assert(IV.getBitWidth() == getContext().getTypeSize(OOE->getType())); 665226586Sdim assert(OOE->getType()->isIntegerType()); 666226586Sdim assert(IV.isSigned() == OOE->getType()->isSignedIntegerOrEnumerationType()); 667226586Sdim SVal X = svalBuilder.makeIntVal(IV); 668234353Sdim B.generateNode(OOE, Pred, 669234353Sdim Pred->getState()->BindExpr(OOE, Pred->getLocationContext(), 670234353Sdim X)); 671226586Sdim } 672226586Sdim // FIXME: Handle the case where __builtin_offsetof is not a constant. 673226586Sdim} 674226586Sdim 675226586Sdim 676226586Sdimvoid ExprEngine:: 677226586SdimVisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, 678226586Sdim ExplodedNode *Pred, 679226586Sdim ExplodedNodeSet &Dst) { 680243830Sdim StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 681226586Sdim 682226586Sdim QualType T = Ex->getTypeOfArgument(); 683226586Sdim 684226586Sdim if (Ex->getKind() == UETT_SizeOf) { 685226586Sdim if (!T->isIncompleteType() && !T->isConstantSizeType()) { 686226586Sdim assert(T->isVariableArrayType() && "Unknown non-constant-sized type."); 687226586Sdim 688226586Sdim // FIXME: Add support for VLA type arguments and VLA expressions. 689226586Sdim // When that happens, we should probably refactor VLASizeChecker's code. 690226586Sdim return; 691226586Sdim } 692226586Sdim else if (T->getAs<ObjCObjectType>()) { 693226586Sdim // Some code tries to take the sizeof an ObjCObjectType, relying that 694226586Sdim // the compiler has laid out its representation. Just report Unknown 695226586Sdim // for these. 696226586Sdim return; 697226586Sdim } 698226586Sdim } 699226586Sdim 700234353Sdim APSInt Value = Ex->EvaluateKnownConstInt(getContext()); 701234353Sdim CharUnits amt = CharUnits::fromQuantity(Value.getZExtValue()); 702226586Sdim 703234353Sdim ProgramStateRef state = Pred->getState(); 704234353Sdim state = state->BindExpr(Ex, Pred->getLocationContext(), 705234353Sdim svalBuilder.makeIntVal(amt.getQuantity(), 706226586Sdim Ex->getType())); 707234353Sdim Bldr.generateNode(Ex, Pred, state); 708226586Sdim} 709226586Sdim 710226586Sdimvoid ExprEngine::VisitUnaryOperator(const UnaryOperator* U, 711226586Sdim ExplodedNode *Pred, 712234353Sdim ExplodedNodeSet &Dst) { 713243830Sdim StmtNodeBuilder Bldr(Pred, Dst, *currBldrCtx); 714226586Sdim switch (U->getOpcode()) { 715234353Sdim default: { 716234353Sdim Bldr.takeNodes(Pred); 717234353Sdim ExplodedNodeSet Tmp; 718234353Sdim VisitIncrementDecrementOperator(U, Pred, Tmp); 719234353Sdim Bldr.addNodes(Tmp); 720234353Sdim } 721226586Sdim break; 722226586Sdim case UO_Real: { 723226586Sdim const Expr *Ex = U->getSubExpr()->IgnoreParens(); 724226586Sdim 725234353Sdim // FIXME: We don't have complex SValues yet. 726234353Sdim if (Ex->getType()->isAnyComplexType()) { 727234353Sdim // Just report "Unknown." 728234353Sdim break; 729234353Sdim } 730226586Sdim 731234353Sdim // For all other types, UO_Real is an identity operation. 732234353Sdim assert (U->getType() == Ex->getType()); 733234353Sdim ProgramStateRef state = Pred->getState(); 734234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 735234353Sdim Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 736234353Sdim state->getSVal(Ex, LCtx))); 737234353Sdim break; 738226586Sdim } 739226586Sdim 740234353Sdim case UO_Imag: { 741226586Sdim const Expr *Ex = U->getSubExpr()->IgnoreParens(); 742234353Sdim // FIXME: We don't have complex SValues yet. 743234353Sdim if (Ex->getType()->isAnyComplexType()) { 744234353Sdim // Just report "Unknown." 745234353Sdim break; 746226586Sdim } 747234353Sdim // For all other types, UO_Imag returns 0. 748234353Sdim ProgramStateRef state = Pred->getState(); 749234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 750234353Sdim SVal X = svalBuilder.makeZeroVal(Ex->getType()); 751234353Sdim Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, X)); 752234353Sdim break; 753226586Sdim } 754226586Sdim 755226586Sdim case UO_Plus: 756239462Sdim assert(!U->isGLValue()); 757226586Sdim // FALL-THROUGH. 758226586Sdim case UO_Deref: 759226586Sdim case UO_AddrOf: 760226586Sdim case UO_Extension: { 761234353Sdim // FIXME: We can probably just have some magic in Environment::getSVal() 762234353Sdim // that propagates values, instead of creating a new node here. 763234353Sdim // 764226586Sdim // Unary "+" is a no-op, similar to a parentheses. We still have places 765226586Sdim // where it may be a block-level expression, so we need to 766226586Sdim // generate an extra node that just propagates the value of the 767234353Sdim // subexpression. 768226586Sdim const Expr *Ex = U->getSubExpr()->IgnoreParens(); 769234353Sdim ProgramStateRef state = Pred->getState(); 770234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 771234353Sdim Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, 772234353Sdim state->getSVal(Ex, LCtx))); 773234353Sdim break; 774226586Sdim } 775226586Sdim 776226586Sdim case UO_LNot: 777226586Sdim case UO_Minus: 778226586Sdim case UO_Not: { 779239462Sdim assert (!U->isGLValue()); 780226586Sdim const Expr *Ex = U->getSubExpr()->IgnoreParens(); 781234353Sdim ProgramStateRef state = Pred->getState(); 782234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 783226586Sdim 784234353Sdim // Get the value of the subexpression. 785234353Sdim SVal V = state->getSVal(Ex, LCtx); 786226586Sdim 787234353Sdim if (V.isUnknownOrUndef()) { 788234353Sdim Bldr.generateNode(U, Pred, state->BindExpr(U, LCtx, V)); 789234353Sdim break; 790234353Sdim } 791226586Sdim 792234353Sdim switch (U->getOpcode()) { 793234353Sdim default: 794234353Sdim llvm_unreachable("Invalid Opcode."); 795234353Sdim case UO_Not: 796234353Sdim // FIXME: Do we need to handle promotions? 797249423Sdim state = state->BindExpr(U, LCtx, evalComplement(V.castAs<NonLoc>())); 798234353Sdim break; 799234353Sdim case UO_Minus: 800234353Sdim // FIXME: Do we need to handle promotions? 801249423Sdim state = state->BindExpr(U, LCtx, evalMinus(V.castAs<NonLoc>())); 802234353Sdim break; 803234353Sdim case UO_LNot: 804234353Sdim // C99 6.5.3.3: "The expression !E is equivalent to (0==E)." 805234353Sdim // 806234353Sdim // Note: technically we do "E == 0", but this is the same in the 807234353Sdim // transfer functions as "0 == E". 808234353Sdim SVal Result; 809249423Sdim if (Optional<Loc> LV = V.getAs<Loc>()) { 810234353Sdim Loc X = svalBuilder.makeNull(); 811249423Sdim Result = evalBinOp(state, BO_EQ, *LV, X, U->getType()); 812234353Sdim } 813249423Sdim else if (Ex->getType()->isFloatingType()) { 814249423Sdim // FIXME: handle floating point types. 815249423Sdim Result = UnknownVal(); 816249423Sdim } else { 817234353Sdim nonloc::ConcreteInt X(getBasicVals().getValue(0, Ex->getType())); 818249423Sdim Result = evalBinOp(state, BO_EQ, V.castAs<NonLoc>(), X, 819234353Sdim U->getType()); 820234353Sdim } 821234353Sdim 822234353Sdim state = state->BindExpr(U, LCtx, Result); 823234353Sdim break; 824226586Sdim } 825234353Sdim Bldr.generateNode(U, Pred, state); 826234353Sdim break; 827226586Sdim } 828226586Sdim } 829234353Sdim 830234353Sdim} 831234353Sdim 832234353Sdimvoid ExprEngine::VisitIncrementDecrementOperator(const UnaryOperator* U, 833234353Sdim ExplodedNode *Pred, 834234353Sdim ExplodedNodeSet &Dst) { 835226586Sdim // Handle ++ and -- (both pre- and post-increment). 836226586Sdim assert (U->isIncrementDecrementOp()); 837226586Sdim const Expr *Ex = U->getSubExpr()->IgnoreParens(); 838226586Sdim 839234353Sdim const LocationContext *LCtx = Pred->getLocationContext(); 840234353Sdim ProgramStateRef state = Pred->getState(); 841234353Sdim SVal loc = state->getSVal(Ex, LCtx); 842234353Sdim 843234353Sdim // Perform a load. 844234353Sdim ExplodedNodeSet Tmp; 845234353Sdim evalLoad(Tmp, U, Ex, Pred, state, loc); 846234353Sdim 847234353Sdim ExplodedNodeSet Dst2; 848243830Sdim StmtNodeBuilder Bldr(Tmp, Dst2, *currBldrCtx); 849234353Sdim for (ExplodedNodeSet::iterator I=Tmp.begin(), E=Tmp.end();I!=E;++I) { 850226586Sdim 851234353Sdim state = (*I)->getState(); 852234353Sdim assert(LCtx == (*I)->getLocationContext()); 853234353Sdim SVal V2_untested = state->getSVal(Ex, LCtx); 854226586Sdim 855234353Sdim // Propagate unknown and undefined values. 856234353Sdim if (V2_untested.isUnknownOrUndef()) { 857234353Sdim Bldr.generateNode(U, *I, state->BindExpr(U, LCtx, V2_untested)); 858234353Sdim continue; 859234353Sdim } 860249423Sdim DefinedSVal V2 = V2_untested.castAs<DefinedSVal>(); 861226586Sdim 862234353Sdim // Handle all other values. 863234353Sdim BinaryOperator::Opcode Op = U->isIncrementOp() ? BO_Add : BO_Sub; 864234353Sdim 865234353Sdim // If the UnaryOperator has non-location type, use its type to create the 866234353Sdim // constant value. If the UnaryOperator has location type, create the 867234353Sdim // constant with int type and pointer width. 868234353Sdim SVal RHS; 869234353Sdim 870234353Sdim if (U->getType()->isAnyPointerType()) 871234353Sdim RHS = svalBuilder.makeArrayIndex(1); 872243830Sdim else if (U->getType()->isIntegralOrEnumerationType()) 873243830Sdim RHS = svalBuilder.makeIntVal(1, U->getType()); 874234353Sdim else 875243830Sdim RHS = UnknownVal(); 876234353Sdim 877234353Sdim SVal Result = evalBinOp(state, Op, V2, RHS, U->getType()); 878234353Sdim 879234353Sdim // Conjure a new symbol if necessary to recover precision. 880234353Sdim if (Result.isUnknown()){ 881234353Sdim DefinedOrUnknownSVal SymVal = 882243830Sdim svalBuilder.conjureSymbolVal(0, Ex, LCtx, currBldrCtx->blockCount()); 883234353Sdim Result = SymVal; 884226586Sdim 885234353Sdim // If the value is a location, ++/-- should always preserve 886234353Sdim // non-nullness. Check if the original value was non-null, and if so 887234353Sdim // propagate that constraint. 888234353Sdim if (Loc::isLocType(U->getType())) { 889234353Sdim DefinedOrUnknownSVal Constraint = 890234353Sdim svalBuilder.evalEQ(state, V2,svalBuilder.makeZeroVal(U->getType())); 891226586Sdim 892234353Sdim if (!state->assume(Constraint, true)) { 893234353Sdim // It isn't feasible for the original value to be null. 894234353Sdim // Propagate this constraint. 895234353Sdim Constraint = svalBuilder.evalEQ(state, SymVal, 896234353Sdim svalBuilder.makeZeroVal(U->getType())); 897226586Sdim 898234353Sdim 899234353Sdim state = state->assume(Constraint, false); 900234353Sdim assert(state); 901226586Sdim } 902226586Sdim } 903226586Sdim } 904234353Sdim 905234353Sdim // Since the lvalue-to-rvalue conversion is explicit in the AST, 906234353Sdim // we bind an l-value if the operator is prefix and an lvalue (in C++). 907239462Sdim if (U->isGLValue()) 908234353Sdim state = state->BindExpr(U, LCtx, loc); 909234353Sdim else 910234353Sdim state = state->BindExpr(U, LCtx, U->isPostfix() ? V2 : Result); 911234353Sdim 912234353Sdim // Perform the store. 913234353Sdim Bldr.takeNodes(*I); 914234353Sdim ExplodedNodeSet Dst3; 915234353Sdim evalStore(Dst3, U, U, *I, state, loc, Result); 916234353Sdim Bldr.addNodes(Dst3); 917226586Sdim } 918234353Sdim Dst.insert(Dst2); 919226586Sdim} 920